nessa to be honest i dont know how i do 4ltrs but i do and have done since i started cd, around wk 11 i lost it with water for a few wks and was only doing 2 1/2 ltrs and it showed in my weight loss, got some water flavouring and got back on track to doing 4 ltrs, yesterday done 4 1/2 ltrs! and have done 5 b4 now